We used these around the aviary and they work great!Go to the feed store and get the stinky traps they sell for horses. Usually it's a plastic jug you mix water and the bait into. Hang them around the edge of the yard and by areas of the house you're not always near (they smell like rotting meat).
Replace the water level as it evaporates, replace the bait once a month or so. Empty them when you replace the bait.